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ARTÍCULO
TITULO

Evaluation of plant and fruit traits in recombinant inbred lines of tomato obtained from a cross between Lycopersicon esculentum and L. pimpinellifolium. Cien. Inv. Agr.(In English) 33(2):111-118.

Gustavo R. Rodríguez    
Guillermo R. Pratta    
Roxana Zorzoli    
Liliana A. Picardi    

Resumen

Seventeen recombinant inbred lines of tomato (Lycopersicon esculentum) were obtained from an interspecific cross between tomato cv. ?Caimanta? and the accession LA722 of L. pimpinellifolium. Plant and fruit traits were evaluated in these lines as well as in the parental genotypes that served as controls. Significant differences were found among parental genotypes and recombinant inbred lines for plant traits (internodes length between third and fourth node, number of flowers per inflorescence, stem perimeter at the basal, middle, and apical part) and fruit traits (soluble solid content, pH, acidity, diameter, height, shape, weight, and shelf life). Significant differences were also found among recombinant inbred lines, in spite of the fact that many of them were similar to the wild parent. Fifteen lines had longer shelf life than LA722 that was the parent with the longest shelf life. A multivariate analysis of canonical correlation with plant and fruit traits and a cluster analysis were performed to classify the lines and the parental genotypes according to their performance for these traits. The first canonical correlation explained 73% of the total variance (p<0.01). According to the canonical coefficients those plants with the biggest stem perimeter and the lowest number of flowers per cluster produced the heaviest and the biggest fruits but they had low acidity. In the cluster analysis, shelf life was an important discriminatory trait for these lines and the parental genotypes. ?Caimanta? was the only genotype located in one group. The other clusters had genotypes with similar values for stem perimeter, fruit size, fruit weight, acidity and fruit shelf life. It was possible to obtain new genotypes that have recombinant traits from the parental genotypes and some of the new genotypes have an even longer shelf life than the wild parent. In conclusion, some of these new genotypes would be a new source of variability useful in tomato breeding programs. Diecisiete líneas recombinates de tomate generadas por el cruzamiento interespecífico entre Lycopersicon esculentum cv. Caimanta y la línea LA722 de L. pimpinellifolium se evaluaron en su comportamiento para caracteres de planta (longitud del tercer y cuarto entre nudo, número de flores por inflorescencia y perímetro basal, media y apical del tallo) y de fruto (contenido en sólidos solubles, pH, acidez, diámetro, altura, forma, peso y vida en estantería). Estas líneas fueron significativamente distintas entre ellas y respecto de los progenitores. Sin embargo, las líneas recombinantes correspondieron a fenotipos más afines al genotipo LA722 de L. pimpinellifolium. Quince de estas líneas tuvieron mejor vida en estantería que LA722, progenitor silvestre con mayor vida en estantería. Se utilizó un análisis multivariado de correlaciones canónicas entre los caracteres de planta y fruto y un análisis multivariado de agrupamientos para caracterizar las líneas recombinantes, incluyendo a los progenitores. La primera correlación canónica explicó el 73% de la variación total (p < 0,01). Los coeficientes canónicos sugieren que plantas con mayor perímetro del tallo y bajo número de flores por inflorescencia producen frutos de mayor peso y tamaño pero con menor acidez. En el análisis de agrupamiento la vida en estantería fue un importante carácter para discriminar las líneas recombinantes y los progenitores cuando se consideraron cinco niveles. En un grupo se observó solamente al cv. Caimanta, mientras que en los demás grupos se combinaron genotipos con valores afines para los caracteres perímetro del tallo, tamaño, peso, acidez y vida en estantería de los frutos. Durante el proceso de obtención de estas líneas se recombinaron características de ambos progenitores obteniéndose genotipos con valores superiores al progenitor silvestre tal como fue en la vida en estantería. En conclusión, algunos de estos nuevos genotipos, constituyen una nueva fuente de variabilidad, útil en programas de mejoramiento de tomate.

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